A brown pelican preening, reaching with its beak to the uropygial gland (preen gland) near the base of its tail. Preen oil from the uropygial gland is spread by the pelican's beak and back of its head to all other feathers on the pelican, helping to keep them water resistant and dry Endangered / Threatened Species Photos.
Image ID: 30326
Species: Brown Pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus
Location: La Jolla, California, USA

Blue whale skeleton in Antarctica, on the shore at Port Lockroy, Antarctica. This skeleton is composed primarily of blue whale bones, but there are believed to be bones of other baleen whales included in the skeleton as well. Endangered / Threatened Species Image.
Image ID: 25604
Species: Blue whale, Balaenoptera musculus
Location: Port Lockroy, Antarctic Peninsula, Antarctica

Humpback whale lunge feeding on Antarctic krill, with mouth open and baleen visible. The humbpack's throat grooves are seen as its pleated throat becomes fully distended as the whale fills its mouth with krill and water. The water will be pushed out, while the baleen strains and retains the small krill. Professional stock photos of Endangered / Threatened Species.
Image ID: 25648
Species: Humpback whale, Megaptera novaeangliae
Location: Gerlache Strait, Antarctic Peninsula, Antarctica

Blue whale. The sleek hydrodynamic shape of the enormous blue whale allows it to swim swiftly through the ocean, at times over one hundred miles in a single day. Endangered / Threatened Species Image.
Image ID: 21250
Species: Blue whale, Balaenoptera musculus
Location: La Jolla, California, USA

A huge blue whale swims through the open ocean in this aerial photograph. The blue whale is the largest animal ever to live on Earth. Endangered / Threatened Species Picture.
Image ID: 02169
Species: Blue whale, Balaenoptera musculus